问替代谷歌广告中"Math.random“的替代方案(Flash AS2)？

EN

    var pressed = false;

    var go = function() {

    width = 300;
    height = 200;
    max_snowsize = 20;
    snowflakes = 15;


for (i=0; i<snowflakes; i++) {

    t = attachMovie("snow", "snow"+i, i);
    t._alpha = 40+Math.random()*60;
    t._x = -(width/2)+Math.random()*(1.5*width);
    t._y = -(height/2)+Math.random()*(1.5*height);
    t._xscale = t._yscale=50+Math.random()*(max_snowsize*10);
    t.k = 1+Math.random()*2;
    t.wind = -1.5+Math.random()*(1.4*3);
    t.onEnterFrame = mover;
}
    };


    mover = function() {
this._y += this.k;
this._x += this.wind;
if (this._y>height+10) {
    this._y = -20;
}
if (this._x>width+20) {
    this._x = -(width/2)+Math.random()*(1.5*width);
    this._y = -20;
} else if (this._x<-20) {
    this._x = -(width/2)+Math.random()*(1.5*width);
    this._y = -20;
}

if(pressed){
    this._alpha -= 1;
}
    }

    // start snow

    go();